refactor: update roles tags + drop cron tag

README-FR.md

README.md

roles/ynh_apps/tasks/app.yml

roles/ynh_apps/tasks/apps.yml

roles/ynh_apps/tasks/main.yml

roles/ynh_backup/tasks/backup.yml

roles/ynh_backup/tasks/borgbackup.yml

roles/ynh_backup/tasks/main.yml

roles/ynh_config/tasks/autoupdate.yml

roles/ynh_setup/tasks/main.yml